Temperature Is Low/Isolate Temperature Monitor Circuit; T-1.7.1 Isolate Ntc #2; Temperature More Than 36.0 Degrees C/Isolate Monitor (Ntc #3) - Fresenius Medical Care 2008T Troubleshooting Manual

T- 1.7.0 TEMPERATURE IS LOW / ISOLATE TEMPERATURE MONITOR CIRCUIT
a) Return the concentrate connectors to their rinse ports
Place the machine into HEAT DISINFECT!
b)
c) Being aware that flow does not stop, remove the dialyzer connectors from the shunt and connect them
to a Temperature (° C) meter but
d) Ignoring a possible temporary "Flow Recirc Error" the "Cover is Open" banner presents.
e) ENSURING a "No Water" alarm NEVER occurs, the external flow indicator's 'bob' MUST be moving up
and down!
f) See procedure number
T- 1.7.1 ISOLATE NTC #2
a) Figure right, unplug the connector from the
board position from the left, "CON-NTC". This is NTC #2 and
unplugging it should turn the heater on fully.
WARNING!
b) To avoid damage, DO NOT leave the
machine.
c) The meter's temperature should eventually increase. If incoming water is very cold response may take
up to seven (7) minutes. If incoming water is at normal temperature usually within three (3) minutes.
d) WITHOUT LOOKING AWAY, watch the external meter for UP TO seven (7) minutes OR until if it
reaches 36.0° C OR more?
Yes 36.0° C OR more! See procedure number
No Remains less than 36.0° C! Leaving NTC #2 unplugged, proceed to
procedure number
T- 1.7.4 TEMPERATURE MORE THAN 36.0° C / ISOLATE MONITOR (NTC #3)
a) Call debug screen 4. If debug does not appear press 'Esc' then call screen 4.
b) From debug screen 4, is TEMP (lower left) 4.0 OR more?
Yes TEMP 4.0 or more. Proceed to
No TEMP less than 4.0! See parts THROUGH c below:
a) Turn the machine OFF!
b) Replace NTC #3* with a known good.* To LOCATE NTC #3 refer to see
(page 236).
c) Proceed to
DO NOT
shut the door
T- 1.7.1 (page 275).
st
1
distribution
T- 1.7.5.
page 277
page 320
, procedure number
2008T Troubleshooting Guide
P/N 490292 Rev. A
T- 1.7.4 (page 275).
page 276
, procedure number T-
T- 7.0.0.
,
1.7.72.
Figure 42
Page 275